Shaw-skank prison worker Joyce “Tillie” Mitchell was reportedly dining on Chinese food when she decided not to help deliver two inmates to freedom.

Mitchell had a “moment of clarity” while dining out with husband Lyle just hours before convicted killers Richard Matt and David Sweat sneaked out of Clinton Correctional Facility, a law enforcement official told the Buffalo News.

“They went out to dinner at a Chinese restaurant after work at the prison, and Joyce Mitchell had a realization that this was ­D-Day, and the fantasy she had been living for almost a year was now becoming a reality that included the murder of her husband, who had been a good and supportive man,” the source said.

The official also revealed that Matt shed nearly 50 pounds in order to break out of the slammer. The killer — who was fatally shot by a federal agent on June 26 — apparently went on a crash diet at the Clinton Correctional Facility so he could fit through a 2-foot-wide steampipe.

“Prison officials said he lost 40 to 50 pounds . . . to fit inside the pipe,” the official told the paper.